MAX14938GWE+T

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Digital Isolators involve a growing family of products that use semiconductor processes, galvanic isolation techniques, and proprietary signal processing algorithms to safely transfer digital information across an isolation barrier. The MAX14938GWE+T are an excellent example of digital isolators that offer improved accuracy and reliability for applications requiring digital communication and power line transceivers. This article will discuss the application fields and working principle of the MAX14938GWE+T digital isolators.

Application Fields of MAX14938GWE+T Digital Isolators

Digital isolators offer an important safeguard for electronic equipment by isolating critical circuit paths to prevent signal-coupling issues including ground loop problems, conducted emissions/noise, and EMI radiation. As such, digital isolators are commonly used in industrial automation, automotive control systems, robotics and medical/biomedical equipment. The MAX14938GWE+T is designed for industrial applications such as electric motors, programmable logic controllers (PLCs), AC and DC power systems, UPS systems, and traction control systems. The MAX14938GWE+T is also suitable for use in motor control applications where accuracy and noise rejection are paramount.

The MAX14938GWE+T also offers benefits to industrial applications where optical isolation is not feasible. In high-speed communication applications, digital isolators can reduce signal distortion from common-mode noise that can occur in cables and fiber-optic systems. The MAX14938GWE+T is capable of relocating certain parts of the isolated system remotely and reducing the system size, providing a fast, cost-effective solution for achieving electrical isolation.

Working Principle of MAX14938GWE+T Digital Isolators

The MAX14938GWE+T is a digital isolator device with galvanic isolation up to 6kVrms. It uses a proprietary signal processing algorithm along with a specialized high-voltage isolation circuit to create the isolation barrier between the two circuit paths. The device utilizes a full-bridge transformer consisting of two primary windings and two secondary windings to transfer the data signals across the barrier. The primary and secondary windings are magnetically coupled through an isolation barrier to allow the digital signal to be transferred without making contact with the external circuit.

The MAX14938GWE+T also utilizes a high-voltage protection circuit on the secondary side of the device to protect the circuitry from transient voltages caused by electrostatic discharges (ESD). The device’s high-voltage protection circuit can handle input voltages as high as 800V, allowing the digital isolator to maintain high accuracy in noisy environments with high voltage transients.

In addition, the MAX14938GWE+T utilizes two voltage regulators on the primary side of the isolator, one for the signal voltage and one for the power supply voltage. These voltage regulators provide stable power over temperature and supply transients, reducing power consumption and allowing the device to reliably transfer signals over long distances.

The MAX14938GWE+T has excellent noise immunity due to its high-impedance floating isolator structure, allowing it to reject common-mode noise up to 980Vp-p, and differential-mode noise up to 480Vp-p. This makes the MAX14938GWE+T suitable for applications in noisy industrial environments.

Conclusion

The MAX14938GWE+T digital isolator has a variety of applications including industrial automation, automotive control systems, robotics, and medical/biomedical equipment. It features a proprietary signal processing algorithm and high-voltage protection circuit that allows the device to maintain high accuracy in noisy environment with high voltage transients. The isolator also has excellent noise immunity, allowing it to reject high levels of common-mode and differential-mode noise. The MAX14938GWE+T is an excellent choice for applications requiring effective digital communication and power line transceivers.

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